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Leon Czolgosz shot President William McKinley on September 6th, but he died at 2:15 a.m. on September 14 and Vice-President Theodore Roosevelt was sworn in as president later that day.
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The first underground portion of the New York City subway opens on October 27, 1904.
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Prominent civil and women's rights leader Susan B. Anthony dies on March 13, 1906
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At 5:12 a.m. on April 18, 1906, the "Great San Francisco Earthquake" strikes.
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Henry Ford begins production of the Model T in 1908.
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RMS Titanic strikes an iceberg and sinks on April 15, 1912.
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The first major world war beings on July 28th, 1914, and ends on November 11th, 1918.
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On April 6, 1917, the U.S. Congress declares war on Germany, marking America's entry into World War I.